Hello My delta also have this xenon headlights and waterjet options and i am not satisfied about lighting. I have a plan to order new headlights and if i remember correctly they are D2S type xenon (Not sure) but high beams are normal Also D2S types had to use halogen lights externally for high beams. because it reaches full luminescence level after 1-2 seconds. Therefore, while the low beams are not on, the other cars may not receive a warning when the flash is needed. Examples of this headlight are the astra h and w211 models. There is also a halogen lights for high beam separate from the lens. New generation D1S or D3S lights instantly reach full lighting level. you can flash it many times. In these types, there is no need for halogen reflectors and the headlights have started to consist only of lenses. While the dipped headlights are on, the D2S type lens switches from short to long and the halogen bulb lights up. (Our cars like this) This is my knowladge about xenon lights equipped at Delta, i hope it can be helpfull. Greetings from Istanbul